<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="./vue.js"></script>
</head>

<body>
    <div id="app">

        <select v-model="pIndex" >
            <option v-for="(s,index) in options" :value="index">{{s.name}}</option>
        </select>

        <select v-model="cIndex">
            <option v-for=" (c,index) in options[pIndex].citys"  :value="index">{{c.name}}</option>
        </select>

        <select v-model="zIndex">
            <option v-for="(z,index) in options[pIndex].citys[cIndex].zones" :value="index">{{z}}</option>
        </select>

    </div>
    <script>
        new Vue({
            el: '#app',
            data: {
                pIndex:0,
                cIndex:0,
                zIndex:0,
                options:[
                    {name:'河南', citys:[{name:'平顶山',zones:['叶县','鲁山']},{name:'郑州',zones:['经开区','金水区']}]},
                    {name:'北京', citys:[{name:'北京1',zones:['北京11','北京11']},{name:'北京2',zones:['北京21','北京22','北京23','北京24']}]},
                    {name:'天津', citys:[{name:'天津1',zones:['天津11','天津11']},{name:'天津2',zones:['天津22','天津22']}]},
               
                ],


            },
        })
    </script>
</body>

</html>